CN107558962A - Concentric tube type batch-type gaslift drainage technology - Google Patents
Concentric tube type batch-type gaslift drainage technology Download PDFInfo
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- CN107558962A CN107558962A CN201710601819.7A CN201710601819A CN107558962A CN 107558962 A CN107558962 A CN 107558962A CN 201710601819 A CN201710601819 A CN 201710601819A CN 107558962 A CN107558962 A CN 107558962A
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Abstract
The invention belongs to cbm development and mining technical field, it is low in low-yield water coal bed gas well or coal bed gas well mining later stage liquid level for existing coal bed gas well mining technology, aquifer yield is few, oil pumper is caused to dally, the problems such as dry grinding, the invention provides a kind of concentric tube type batch-type gaslift drainage technology, the technique is completed by concentric tube gas lift system, described concentric tube gas lift system includes moisture trap, GCU, supercharger and concentric tube column, moisture trap, GCU, supercharger is mounted on ground, moisture trap is connected by pipeline with coal bed gas well, concentric tube column is installed in coal bed gas well.The gases at high pressure of injection act only on oil pipe with the closing space of hollow beam hanger annular space, avoiding gases at high pressure and impurity being pressed into cracks in coal seam, injure reservoir；The keying for comparing feedback arrangement signal and controlling concentric tube gas lift system of operating pressure is preset by levels pressure in coal bed gas well and GCU.
Description
Technical field
The invention belongs to cbm development and mining technical field, and in particular to a kind of concentric tube type batch-type gaslift draining
Technique.
Background technology
In low yield pool or the mining later stage of coal bed gas well, because stratum supply capacity is weak, coal bed gas well fluid column rises slow
Slowly, conventional sucker rod pump drainage efficiency is low, it is necessary to which oil pumper long time running could discharge partially liq outside well.Oil pumper
Long-term poorly efficient idle running, not only causes energy waste, can also increase the degree of wear of machine.And gaslift process drain efficiency high, and
Small, the mining available in this case coal bed gas well by depth, the influence degree of hole deviation.But existing gaslift technique is mostly gaslift
Valve type gaslift, the technique downhole tool is more, and gas lift valve safeguards that replacing is cumbersome, and investment is also of a relatively high.Simultaneously as coal bed gas
Well interval of interest sleeve pipe is shot through, and some coal bed gas wells have multiple target zones.In gases at high pressure injection process, it should also keep away
Exempt from gas and enter reservoir from preforation tunnel, not only cause gases at high pressure loss, gaslift can not be smoothly completed, can also be by water, coal
In the press-in reservoir fracture such as powder, potential injury is brought to reservoir.Therefore, a kind of simple, efficient, energy-conservation water discharge technology is needed badly,
To meet the efficient mining of the mining later stage coal bed gas well in low yield pool or coal bed gas well.And concentric tube type batch-type gaslift draining
Technique, then it can preferably meet the demand.
The content of the invention
Shanxi Jincheng Anthracite Mining Industry Group Co., Ltd.'s coal is with coal bed gas Gong Cai National Key Laboratories for existing
There is coal bed gas well mining technology low-yield water coal bed gas well or coal bed gas well mining later stage liquid level be low, aquifer yield is few, cause to pump
The problems such as machine idle running, dry grinding, and then provide a kind of concentric tube type batch-type gaslift drainage technology.
The present invention adopts the following technical scheme that：
A kind of concentric tube type batch-type gaslift drainage technology, the technique are completed by concentric tube gas lift system, described concentric tube
Gas lift system includes moisture trap, GCU, supercharger and concentric tube column, moisture trap, GCU,
Supercharger is mounted on ground, and supercharger is connected with GCU, and moisture trap is connected by pipeline with coal bed gas well,
Concentric tube column is installed in coal bed gas well；
The gases at high pressure of injection are acted only in the closing space of oil pipe and hollow beam hanger annular space, and gases at high pressure are not during gaslift
It can avoid gases at high pressure that impurity is pressed into cracks in coal seam from casing wall perforated interval loss, injure reservoir；
Pass through levels pressure in coal bed gas well（Oil pipe and the pressure in hollow beam hanger annular space）Work is preset with GCU
The keying for comparing feedback arrangement signal control concentric tube gas lift system of pressure.
Described concentric tube column includes oil pipe, hollow beam hanger, standing valve and screen casing, and standing valve is installed on oil pipe bottom, Gu
Determine valve bottom connection screen casing, hollow oil pipe is concentrically mounted in oil pipe, and hollow oil pipe bottom is provided with pressure bomb, underground pressure
Power meter is connected with GCU.
Specific construction technique is as follows：
Tripping in concentric tube column in coal bed gas well, the standing valve of concentric tube column is set to be located at more than purpose roof；
According to the critical desorption pressures and aquifer yield of coal bed gas well, the startup operating pressure of GCU is set；
Before gaslift draining, the liquid in coal seam makes the liquid of oil jacket annular space, oil pipe and hollow beam hanger annular space by standing valve and screen casing
Face mutually maintains an equal level, and when bottom pressure is above the ground level the default startup operating pressure of control device, bottom hole pressure bomb is by pressure signal
Reach GCU and control gas lift system to open, natural gas is pressed into well by compressor from oil pipe and hollow beam hanger annular space
Interior, standing valve is closed, and liquid is enumerated ground from hollow beam hanger, and gas-liquid separation is carried out into moisture trap；
When bottom pressure is reduced to below the default startup operating pressure of GCU, gaslift stops, and bleeds off injection
Gas, now standing valve opened in the presence of oil jacket annular space head of liquid, coal seam water is mended again by bottom screen casing, standing valve
It is charged in oil pipe and hollow beam hanger, oil jacket annular space, the liquid level of oil pipe and hollow beam hanger annular space is reached new balance；
When bottom pressure reaches the default startup operating pressure of GCU, gas lift system is again started up, and opens new one
The gaslift of wheel, so circulation, so as to realize the batch (-type) of coal bed gas well, automation mining.
The present invention has advantages below：
（1）The mining efficiency of coal bed gas well is improved, reduces energy resource consumption.Conventional sucker rod pump mining technology is efficiently solved low
When producing pool or low coal bed gas well mining later stage aquifer yield, the low problem of drainage efficiency.Due to stratum moisturizing ability, oil pumper
Long time running is needed, well inside points liquid could be discharged outside well.The long-term poorly efficient idle running of oil pumper, sucker rod pump is caused to do for a long time
Mill, notable infringement is brought to machine.Meanwhile also create substantial amounts of power wastage.
（2）The risk of gaslift gas leakage is reduced, reduces potential injury of the gases at high pressure to coal seam reservoirs.Due to concentric oil tubes and admittedly
Determine the presence of valve, having ensured the gas of injection can only act in the annular space of oil pipe and hollow beam hanger.Even if coal seam section is penetrated
Hole eyelet, gases at high pressure also will not the gas leakage from eyelet.Gases at high pressure can also be avoided by liquid, coal dust and quartz sand etc. simultaneously
It is pressed into cracks in coal seam, injures reservoir.
（3）Due to the presence of ground batch (-type) control system, avoid after liquid is fully drained in coal bed gas well, high pressure
Gas still constantly injects, and causes the idle running of gas lift system and forms waste.The set system underground equipment is few, Operation and Maintenance letter
It is single, the cost of gaslift is reduced, has ensured the Effec-tive Function of gas lift system.
Brief description of the drawings
Fig. 1 is the structural representation of concentric tube column；
Fig. 2 is the connection diagram of concentric tube gas lift system；
In figure：1- moisture traps, 2- GCUs, 3- superchargers, 4- sleeve pipes, 5- oil jackets annular space, 6- oil pipes, 7- oil pipes
With hollow beam hanger annular space, the hollow beam hangers of 8-, 9- pressure bombs, 10- hoops, 11- standing valves, 12- screen casings, 13- coal seams.
Embodiment
With reference to accompanying drawing, the embodiment of the present invention is described further：
（1）Fig. 1 is concentric tube column structural representation, and the device mainly avoids during gaslift gases at high pressure from casing wall perforation
Section loss, and injury is produced to purpose reservoir.When gaslift gases at high pressure are by out of oil pipe and hollow beam hanger annular space press-in well,
Bottom standing valve is closed, and pressure is only acted in the closing space of oil pipe and hollow beam hanger annular space.When liquid level is reduced to gaslift work
When making below pressure, gaslift stops, and bleeds off injection gas.Now standing valve is opened in the presence of oil jacket annular space head of liquid,
Coal seam water is added in oil pipe and hollow beam hanger again by bottom screen casing, standing valve.Liquid level between hollow beam hanger, oil pipe and sleeve pipe
Reach new balance, when bottom pressure reaches the operating pressure of gaslift setting, monitored by bottom hole pressure bomb, pass to ground control
System, gaslift are carried out again.
（2）Fig. 2 is concentric tube type batch-type gaslift drainage technology connection diagram.When bottom pressure reaches gaslift setting
During operating pressure, GCU starts, gaslift natural gas be pressurized by ground supercharger after from oil pipe and hollow beam hanger
Annular space is injected, and standing valve is closed, and liquid is enumerated ground through hollow beam hanger, into moisture trap.The gas isolated is again
It is pressed into as gaslift with source of the gas in well.When the water isolated reaches setting height in moisture trap, by automatic-discharging.Oil
A coal bed gas part for set annular space output is used as the source of the gas of gaslift, and remainder then enters gathering line.Work as bottom pressure
Less than GCU setting startup pressure when, stop gas injection, bleed off injection gas.Now standing valve is opened, in coal seam
Liquid is entered in oil pipe by screen casing, standing valve, the liquid level between hollow beam hanger, oil pipe and sleeve pipe is reached new balance.
The Specific construction technical process of the present invention is as follows：
（1）Standing valve is installed in oil pipe bottom, and connects screen casing in standing valve bottom, prevents bulky grain coal dust from being caused into standing valve
Block（See accompanying drawing 1）.
（2）The hollow beam hanger composition concentric tube column of tripping in oil pipe, and bottom hole pressure bomb is installed in hollow beam hanger bottom, make
For the core building block of the technique.
（3）According to coal seam depth, concentric tube column is lowered into correct position, the standing valve of concentric tube column is located at purpose coal
It is more than layer top plate.
（4）According to coal bed gas well critical desorption pressures and production regimen condition, the startup work of initial setting GCU
Pressure.
（5）Before gaslift draining, the liquid in coal seam makes oil jacket annular space, oil pipe and hollow beam hanger ring by standing valve and screen casing
Empty liquid level mutually maintains an equal level.When startup pressure of the bottom pressure higher than setting, natural gas is by compressor from oil pipe and hollow beam hanger
Annular space is pressed into, and liquid is from hollow beam hanger output.When startup pressure of the bottom pressure less than ground installation setting, stop gas injection,
Bleed off injection gas.
（6）When the head of liquid in oil pipe and hollow beam hanger annular space reaches the startup pressure of ground installation, ground injection
Equipment starts, and new round gaslift starts.So go round and begin again and the gas-liquid mixture in coal seam is discharged ground, reach water pumping gas production
Purpose.So as to realize the batch (-type) of coal bed gas well, automation, high efficiency mining.
Concentric tube type batch-type gaslift drainage technology drainage effect of the present invention is preferable, can both avoid conventional sucker rod pump
Dally, wear when liquid level is low, cause power wastage.Simultaneously as the gas of injection can only act on more than standing valve, so as to
It effectively prevent gases at high pressure liquid, coal dust and quartz sand etc. are pressed into cracks in coal seam, injure reservoir.Oil pipe and hollow beam hanger
It is a closing space during gaslift, can effectively prevents gases at high pressure from well-case perforating section pressure release.The technique be it is a kind of it is new,
Efficiently, the coal bed gas well water drainage-gas recovery technology of energy-conservation.
Claims (3)
- A kind of 1. concentric tube type batch-type gaslift drainage technology, it is characterised in that：The technique is completed by concentric tube gas lift system, Described concentric tube gas lift system includes moisture trap, GCU, supercharger and concentric tube column, moisture trap, GCU, supercharger are mounted on ground, and supercharger is connected with GCU, moisture trap by pipeline with Coal bed gas well is connected, and concentric tube column is installed in coal bed gas well；The gases at high pressure of injection are acted only in the closing space of oil pipe and hollow beam hanger annular space, and gases at high pressure are not during gaslift It can avoid gases at high pressure that impurity is pressed into cracks in coal seam from casing wall perforated interval loss, injure reservoir；The comparison feedback arrangement signal control that operating pressure is preset by levels pressure in coal bed gas well and GCU is same The keying of heart pipe gas lift system.
- 2. concentric tube type batch-type gaslift drainage technology according to claim 1, it is characterised in that：Described concentric tube column Including oil pipe, hollow beam hanger, standing valve and screen casing, standing valve is installed on oil pipe bottom, standing valve bottom connection screen casing, hollow oil Pipe is concentrically mounted in oil pipe, and hollow oil pipe bottom is provided with pressure bomb, and pressure bomb is connected with GCU.
- 3. concentric tube type batch-type gaslift drainage technology according to claim 2, it is characterised in that Specific construction technique is such as Under：Tripping in concentric tube column in coal bed gas well, the standing valve of concentric tube column is set to be located at more than purpose roof；According to the critical desorption pressures and aquifer yield of coal bed gas well, the startup operating pressure of GCU is set；Before gaslift draining, the liquid in coal seam makes the liquid of oil jacket annular space, oil pipe and hollow beam hanger annular space by standing valve and screen casing Face mutually maintains an equal level, and when bottom pressure is above the ground level the default startup operating pressure of control device, bottom hole pressure bomb is by pressure signal Reach GCU and control gas lift system to open, natural gas is pressed into well by compressor from oil pipe and hollow beam hanger annular space Interior, standing valve is closed, and liquid is enumerated ground from hollow beam hanger, and gas-liquid separation is carried out into moisture trap；When bottom pressure is reduced to below the default startup operating pressure of GCU, gaslift stops, and bleeds off injection Gas, now standing valve opened in the presence of oil jacket annular space head of liquid, coal seam water is mended again by bottom screen casing, standing valve It is charged in oil pipe and hollow beam hanger, oil jacket annular space, the liquid level of oil pipe and hollow beam hanger annular space is reached new balance；When bottom pressure reaches the default startup operating pressure of GCU, gas lift system is again started up, and opens new one The gaslift of wheel, so circulation, so as to realize the batch (-type) of coal bed gas well, automation mining.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710601819.7A CN107558962A (en) | 2017-07-21 | 2017-07-21 | Concentric tube type batch-type gaslift drainage technology |
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| CN201710601819.7A CN107558962A (en) | 2017-07-21 | 2017-07-21 | Concentric tube type batch-type gaslift drainage technology |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109025911A (en) * | 2018-08-23 | 2018-12-18 | 山西晋城无烟煤矿业集团有限责任公司 | A kind of coal bed gas well gaslift draining reservoir protection device and water discharge method |
| CN109798095A (en) * | 2019-03-08 | 2019-05-24 | 南阳市天达同兴石油技术有限公司 | A kind of coal-bed-gas production-increase pressure disturbance device and method for increasing yield of coal bed gas |
| CN111042774A (en) * | 2019-12-25 | 2020-04-21 | 山西晋城无烟煤矿业集团有限责任公司 | Method for switching whole cylinder pump and gas lift extraction mode without sleeve pressure unloading |
| CN112855088A (en) * | 2021-04-06 | 2021-05-28 | 中联煤层气有限责任公司 | Method for improving gas production rate of coal bed |
| CN113027389A (en) * | 2021-04-01 | 2021-06-25 | 中勘资源勘探科技股份有限公司 | Double-ring air-pressure boosting type water lifting pipeline connecting structure and water lifting method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109025911A (en) * | 2018-08-23 | 2018-12-18 | 山西晋城无烟煤矿业集团有限责任公司 | A kind of coal bed gas well gaslift draining reservoir protection device and water discharge method |
| CN109798095A (en) * | 2019-03-08 | 2019-05-24 | 南阳市天达同兴石油技术有限公司 | A kind of coal-bed-gas production-increase pressure disturbance device and method for increasing yield of coal bed gas |
| CN111042774A (en) * | 2019-12-25 | 2020-04-21 | 山西晋城无烟煤矿业集团有限责任公司 | Method for switching whole cylinder pump and gas lift extraction mode without sleeve pressure unloading |
| CN111042774B (en) * | 2019-12-25 | 2021-08-20 | 山西晋城无烟煤矿业集团有限责任公司 | Method for switching whole cylinder pump and gas lift extraction mode without sleeve pressure unloading |
| CN113027389A (en) * | 2021-04-01 | 2021-06-25 | 中勘资源勘探科技股份有限公司 | Double-ring air-pressure boosting type water lifting pipeline connecting structure and water lifting method thereof |
| CN112855088A (en) * | 2021-04-06 | 2021-05-28 | 中联煤层气有限责任公司 | Method for improving gas production rate of coal bed |
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Application publication date: 20180109 |